Songs Missing From iPhone Google Music Playlist

I wanted to pin about half my music collection, so I created 7 playlists (because there is a 1000 song limit) via Google Music.

My playlists range in size from 700 - 950 songs. I pinned these 7 playlists to my iPhone 6 Plus so I can have this music with me at all times.

I noticed recently, sometime soon after pinning the playlists, that songs are missing from each playlist. I'm missing about 50 - 100 songs in each playlist.

Has anybody experienced this issue? Any solution? I'm thinking about simply removing an entire album when I find half of it missing for example and then re-adding it to the playlist. (Which will download the songs automatically to my iPhone.) Has anybody else done this or come up with a better solution? Thanks.

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